- May 29, 2020
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Interesting about the key fob start, but other than that what you described is what I was assuming except that the secondary battery was receiving a charge leading me to believe it was the primary fuse … except that the truck still started. I’ve also never heard of anyone blowing that fuse (though obviously it’s there for a reason) so I’m worried I’m not getting the real story.@Evergreen71
The way my trucks behave is that if the primary is dead, using the key does not start the truck, but it can be remote started using the fob. That assumes there's enough juice left in the battery to energize the isolator. If the primary is completely dead, jumper cables are needed.
The only 175-amp fuse on my trucks is the primary megafuse. If that blew, it would sever the only electrical connection between both batteries and the truck, immobilizeing it.
The only thing I can think of is that your truck has a second 175-amp megafuse for the secondary battery. On mine it's 125-amp. If that blows, it simply isolates the secondary, and you'd never notice unless something went wrong with the primary